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X9428YV-2.7 Datasheet(PDF) 5 Page - Intersil Corporation

Part # X9428YV-2.7
Description  Single Digitally Controlled Potentiometer
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

X9428YV-2.7 Datasheet(HTML) 5 Page - Intersil Corporation

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5
FN8197.0
March 8, 2005
Figure 3. Two-Byte Instruction Sequence
The Increment/Decrement command is different from
the other commands. Once the command is issued
and the X9428 has responded with an acknowledge,
the master can clock the selected wiper up and/or
down in one segment steps; thereby, providing a fine
tuning capability to the host. For each SCL clock pulse
(tHIGH) while SDA is HIGH, the selected wiper will
move one resistor segment towards the VH/RH
terminal. Similarly, for each SCL clock pulse while
SDA is LOW, the selected wiper will move one resistor
segment towards the VL/RL terminal. A detailed
illustration of the sequence and timing for this
operation are shown in Figures 5 and 6 respectively.
Table 1. Instruction Set
Note:
(7) 1/0 = data is one or zero
S
T
A
R
T
0101
A3
A2
0
A0
A
C
K
I3
I2
I1
I0
R1
R0
0
0
A
C
K
SCL
SDA
S
T
O
P
Instruction
Instruction Set
Operation
I3
I2
I1
I0 R1 R0
X1
X0
Read Wiper Counter
Register
1
0
0
1
0
0
0
0
Read the contents of the Wiper Counter Register
Write Wiper Counter
Register
1
0
1
0
0
0
0
0
Write new value to the Wiper Counter Register
Read Data Register
1
0
1
1
1/0
1/0
0
0
Read the contents of the Data Register pointed to by
R1 - R0
Write Data Register
1
1
0
0
1/0
1/0
0
0
Write new value to the Data Register pointed to by
R1 - R0
XFR Data Register to
Wiper Counter Register
1
1
0
1
1/0
1/0
0
0
Transfer the contents of the Data Register pointed to
by R1 - R0 to its Wiper Counter Register
XFR Wiper Counter
Register to Data Register
1
1
1
0
1/0
1/0
0
0
Transfer the contents of the Wiper Counter Register
to the Data Register pointed to by R1 - R0
Increment/Decrement
Wiper Counter Register
0
0
1
0
0
0
0
1/0
Enable Increment/decrement of the Wiper Counter
Register
X9428


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